Most important Maths Topics for NDA Exam Mathematics is an important subject in the NDA exam.Its in itself one Single Paper comprising of 120 Questions and 300 Marks.Defence Aspirants aspiring to Join Air Force and Navy has to mandatory clear this Maths Section. Overall the Candidates should clear 25%  of Maths and GAT Section Let us Discuss About The Important Topics  which are important for NDA. Algebra: Topics like Matrices and Determinants is very important as close to 10Questions are from this Topic. Trigonometry: Topics like trigonometric ratios and Inverse Trignometry Function is important for NDA Differential Calculus: Topics like